Service Description: Boundaries of the eastern ("True" Driftless) and western ("Driftless-style") areas of MN, WI, IA, and IL.
Based on Carson et al. 2023 (WGNHS).
https://wgnhs.wisc.edu/catalog/publication/000997/resource/es057gis
The Driftless Area of southwestern Wisconsin and northwestern Illinois got its name from the lack of glacial sediment ("drift") covering the landscape. The surficial geology and topography of the Driftless Area are thus distinct from the surrounding region where multiple phases of glaciation left their mark. This pamphlet, a collaborative effort between four neighboring state geological surveys, describes and outlines the boundary of the unglaciated Driftless Area based on modern geologic evidence.
This publication and dataset were released to clarify the technical definition of the Driftless Area.
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Description: Digital information for WGNHS Educational Series 057, The Driftless Area. This publication describes the extent of unglaciated ("Driftless") and similar terrains in Wisconsin, Illinois, Iowa, and Minnesota. Digital data consists of lines defining the definite and the inferred boundaries of the Driftless Area in Wisconsin and Illinois, the boundary of "Driftless-style" terrain in Minnesota and Iowa, and the Central Sand Plain in Wisconsin. Each boundary line has associated description and lists works cited in the Descrip and Notes attributes.
Published by the Wisconsin Geological and Natural History Survey in collaboration and partnership with the Illinois State Geological Survey, Iowa Geological Survey, and Minnesota Geological Survey.
Spatial Reference: 26915 (26915)
Initial Extent:
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YMin: 4806094.94768706
XMax: 677173.347058548
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Spatial Reference: 26915 (26915)
Full Extent:
XMin: 530839.4111
YMin: 4635535.3367
XMax: 786813.1184
YMax: 4944951.0586
Spatial Reference: 26915 (26915)
Units: esriMeters
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